I had an IQ of 135 when I was 11, which was based on an estimate of how well I did on the UK's national IQ test.
Now, according to an online test, it's only 110.
As others have said, though, motivation can make up for IQ. I think intelligence =
Savvy+Smarts
IQ is a measure of Savvy, or the ability to learn, which is why it's all about pattern recognition and logic puzzles, analyzing the way you think. Smarts come from bombing through books, but bombing through books can also increase your Savvy, if you're reading the right kind of books.